We highly encourage add-on developers to test their add-ons with the new version and mark them as compatible as soon as possible. The Mozilla Developer Network has detailed information about changes in the new version for add-on developers.

To manually download the latest pre-release software from the various development channels, please visit:

What’s New in Firefox BetaThe latest version of Firefox Beta has the following changes:

The address bar now highlights the domain of the website you're visitingStreamlined the look of the site identity blockAdded support for the latest draft version of WebSockets with a prefixed APIAdded support for EventSource / server-sent eventsAdded support for window.matchMediaAdded Scratchpad, an interactive JavaScript prototyping environmentAdded a new Web Developer menu item and moved development-related items into itImproved usability of the Web ConsoleImproved the discoverability of Firefox SyncReduced browser startup time when using PanoramaPlease see the complete list of changes in this version. You may also be interested in the list of changes in the previous version.